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Method for preparing organosilicone stripping agent by emulsion polymerizing

A technology of emulsion polymerization and silicone, which is applied in the field of preparing silicone release agents, can solve the problems of high requirements for industrial production equipment, and achieve the effects of low production cost, good emulsion uniformity, and reduced operating pressure

Inactive Publication Date: 2018-02-27
TANGSHAN SANYOU SILICON IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many patent declarations for emulsion-type release agents, but most of them are prepared by adding oily substances into solvents and mechanically emulsifying them under the action of emulsifiers such as Span and Tween, all of which require high-speed shearing or homogenizers to achieve The purpose of uniform emulsification requires higher requirements for industrial production equipment

Method used

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  • Method for preparing organosilicone stripping agent by emulsion polymerizing
  • Method for preparing organosilicone stripping agent by emulsion polymerizing
  • Method for preparing organosilicone stripping agent by emulsion polymerizing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 80g of DMC, 130g of deionized water, 10g of dodecylbenzenesulfonic acid, and 2g of low-viscosity hydroxyl silicone oil with a degree of polymerization of 6 into the reactor, raise the temperature to 40°C and stir for 1 hour to prepare a prepolymer emulsion, and continue to add 5g of side chains Polyether silicone oil, 12g sodium dodecylbenzene sulfonate, 2g silane coupling agent KH550, stirred and heated to 85°C for polymerization for 4 hours, then added 5% sodium hydroxide solution to neutralize to neutral, and the emulsion type silicone desulfurizer was obtained. mold agent.

[0031] The technical indicators of the product are as follows:

[0032] Appearance: white with fluorescent blue emulsion; pH value: 7; stability: no separation after centrifugation at 4000r / min for 15min; active ingredient: 45%.

Embodiment 2

[0034] Add 80g of DMC, 130g of deionized water, 10g of hexadecylbenzenesulfonic acid, and 2g of hydroxyl silicone oil with a degree of polymerization of 18 into the reactor, raise the temperature to 40°C and stir for 1 hour to prepare a prepolymer emulsion, and continue to add 5g of terminal polyether Silicone oil, 16g sodium hexadecylbenzenesulfonate, 2g silane coupling agent KH550 as structure control agent, stir and heat up to 95°C for catalytic polymerization, polymerization time is 5h, after the polymerization is completed, directly add 5% sodium hydroxide solution for neutralization , That is, an emulsion-type silicone release agent.

Embodiment 3

[0036] Add 80g of D4, 130g of deionized water, 10g of dodecylbenzenesulfonic acid, and 10g of low-viscosity hydroxyl silicone oil with a viscosity of 25cs into the reaction kettle, raise the temperature to 40-50°C and stir for 1 hour to prepare a prepolymer emulsion, and continue to add 10g of side Chain polyether silicone oil, 12g sodium dodecylbenzene sulfonate, 5g silane coupling agent KH560, stir and raise the temperature to 90°C for catalytic polymerization, the polymerization time is 5h, after the polymerization is completed, directly add ammonia water to neutralize to neutral, and then the emulsion type organic Silicone release agent.

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Abstract

The invention relates to a method for preparing an organosilicone stripping agent, in particular to a method for preparing the organosilicone stripping agent by emulsion polymerizing. The method adopts the emulsion polymerizing technology to prepare the organosilicone stripping agent at one time. The method comprises the following steps of adding deionized water, a catalyst, an end capping agent and an organosilicone ring body into a reaction kettle according to a ratio, and stirring at the temperature of 40 to 60 DEG C, so as to obtain a prepolymer emulsion; adding an emulsifier, a surfactantand a structure control agent, and reacting for 4 to 6h at the temperature of 80 to 95 DEG C; adding a terminating agent, and adjusting the pH (potential of hydrogen) value of the emulsion to the neutral property, so as to obtain the neutral organosilicone stripping agent emulsion. The method has the advantages that the emulsion polymerizing method is adopted, the water is used as a dispersant and can be easily sprayed, and the particle size of the emulsified particle is small. The prepared organosilicone stripping agent has the advantages that the application range is broad, the preparationcost is low, the hazard to environment and health of human body is avoided, and the stripping force on a rubber and plastic product is greatly improved.

Description

technical field [0001] The invention relates to a method for preparing a silicone release agent, in particular to a method for preparing a silicone release agent by emulsion polymerization. Background technique [0002] The use methods and effects of different types of silicone mold release agents in different forms are different. The application methods of bulk silicone oil type and aerosol type mold release agents are the most convenient, as long as the mold release agent is simply brushed or sprayed on the surface of the mold, Plastic products can be molded and processed, and the products are easy to demould; compared with solution-type silicone release agents, water-emulsion-type silicone release agents do not use organic solvents and basically have no pollution to the environment. Compared with the ease of demolding the parts, the peeling force of the water emulsion type release agent is relatively greater, and the number of continuous demoulding is less than that of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/06C08G77/16B29C33/64
CPCB29C33/64C08G77/06C08G77/16
Inventor 孙长江赵磊赵洁刘彬李献起曹鹤任海涛曲雪丽张鹏硕胡质云曹彩虹刘秋艳周健王东英严锦河王议李双玲孙景辉
Owner TANGSHAN SANYOU SILICON IND
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